Michael Koller, lived in NYC 1924

I am looking for information on a Michael Koller who lived at 755 E 168th St, New York City in early 1924. His mother, Theresia Koller, arrived in NY on the USS Mount Clay from Guderica (Kudritz), Jugoslavia (formerly part of the Austro-Hungarian empire) in early January 1924. If my information is correct, he was the brother of my grandfather, Johannes Koller, also from Guderica (Kudritz). He also may have had a sister Genoferva Moris who lived at that time in Bazias, Romania. (Guderica was part of the German enclave known as the Banat, an area comprised today of parts of Serbia, Romania and Hungary.)